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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="is_regular_file.html" title="cpp/filesystem/is regular file"><span class="t-lines"><span>filesystem::is_regular_file</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="is_socket.html" title="cpp/filesystem/is socket"><span class="t-lines"><span>filesystem::is_socket</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="is_symlink.html" title="cpp/filesystem/is symlink"><span class="t-lines"><span>filesystem::is_symlink</span></span></a></div></div></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="../header/filesystem.html" title="cpp/header/filesystem">&lt;filesystem&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> perms<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>此类型代表文件访问权限。 <code>perms</code> 满足<a href="../named_req/BitmaskType.html" title="cpp/named req/BitmaskType"><i>位掩码类型</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(BitmaskType)</span> </a>的要求（表示位运算符 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">&amp;</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">|</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">^</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator~</span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">&amp;</span><span class="sy1">=</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">|</span><span class="sy1">=</span></span></span> 及 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">^</span><span class="sy1">=</span></span></span> 对此类型定义）
</p><p>访问权限模仿 <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_stat.h.html">POSIX 权限位</a>，而且任何单独的文件权限（由 <a href="status.html" title="cpp/filesystem/status">status</a> 报告）都是下列位的某些组合：
</p>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.B8.B8.E9.87.8F">成员常量</span></h3>
<table class="wikitable" style="text-align:left; font-size:85%; max-width:90em;">

<tr>
<th> 成员常量
</th>
<th> 值（八进制）
</th>
<th> POSIX 等价
</th>
<th> 含义
</th></tr>
<tr>
<td> <code>none</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span>
</td>
<td>
</td>
<td> 未设权限位
</td></tr>
<tr>
<td> <code>owner_read</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">0400</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IRUSR</span></span>
</td>
<td> 文件拥有者拥有读权限
</td></tr>
<tr>
<td> <code>owner_write</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">0200</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IWUSR</span></span>
</td>
<td> 文件拥有者拥有写权限
</td></tr>
<tr>
<td> <code>owner_exec</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">0100</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IXUSR</span></span>
</td>
<td> 文件拥有着拥有执行/查找权限
</td></tr>
<tr>
<td> <code>owner_all</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">0700</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IRWXU</span></span>
</td>
<td> 文件拥有者拥有读、写、执行/查找权限
<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">owner_read <span class="sy3">|</span> owner_write <span class="sy3">|</span> owner_exec</span></span>
</p>
</td></tr>
<tr>
<td> <code>group_read</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">040</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IRGRP</span></span>
</td>
<td> 文件用户组拥有读权限
</td></tr>
<tr>
<td> <code>group_write</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">020</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IWGRP</span></span>
</td>
<td> 文件用户组拥有写权限
</td></tr>
<tr>
<td> <code>group_exec</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">010</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IXGRP</span></span>
</td>
<td> 文件用户组拥有执行/查找权限
</td></tr>
<tr>
<td> <code>group_all</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">070</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IRWXG</span></span>
</td>
<td> 文件用户组拥有读、写、执行/查找权限
<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">group_read <span class="sy3">|</span> group_write <span class="sy3">|</span> group_exec</span></span>
</p>
</td></tr>
<tr>
<td> <code>others_read</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">04</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IROTH</span></span>
</td>
<td> 其他用户拥有读权限
</td></tr>
<tr>
<td> <code>others_write</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">02</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IWOTH</span></span>
</td>
<td> 其他用户拥有写权限
</td></tr>
<tr>
<td> <code>others_exec</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">01</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IXOTH</span></span>
</td>
<td> 其他用户拥有执行/查找权限
</td></tr>
<tr>
<td> <code>others_all</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">07</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_IRWXO</span></span>
</td>
<td> 其他用户拥有拥有读、写及执行/查找权限
<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">others_read <span class="sy3">|</span> others_write <span class="sy3">|</span> others_exec</span></span>
</p>
</td></tr>
<tr>
<td> <code>all</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">0777</span></span></span>
</td>
<td>
</td>
<td> 所有用户拥有读、写及执行/查找权限
<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">owner_all <span class="sy3">|</span> group_all <span class="sy3">|</span> others_all</span></span>
</p>
</td></tr>
<tr>
<td> <code>set_uid</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">04000</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_ISUID</span></span>
</td>
<td> 在执行上设置用户 ID 为文件拥有者的用户 ID
</td></tr>
<tr>
<td> <code>set_gid</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">02000</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_ISGID</span></span>
</td>
<td> 在执行上设置组 ID 为文件用户的组 ID
</td></tr>
<tr>
<td> <code>sticky_bit</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">01000</span></span></span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">S_ISVTX</span></span>
</td>
<td> 实现定义的含义，不过 POSIX XSI 指定在设置于目录时，唯有文件拥有者可以删除文件，即使该目录对其他人可写（与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">/</span>tmp</span></span> 一并使用）
</td></tr>
<tr>
<td> <code>mask</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu8">07777</span></span></span>
</td>
<td>
</td>
<td> 所有合法权限位。
<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">all <span class="sy3">|</span> set_uid <span class="sy3">|</span> set_gid <span class="sy3">|</span> sticky_bit</span></span>
</p>
</td></tr></table>
<p>另外，定义此类型的下列常量，它不表示权限：
</p>
<table class="wikitable" style="text-align:left; font-size:85%; max-width:90em;">

<tr>
<th> 成员常量
</th>
<th> 值（十六进制）
</th>
<th> 含义
</th></tr>
<tr>
<td> <code>unknown</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu12">0xFFFF</span></span></span>
</td>
<td> 未知权限（例如当 <a href="file_status.html" title="cpp/filesystem/file status">file_status</a> 以不带权限创建时）
</td></tr></table>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>权限不必用位实现，但概念上用该方式处理它们。
</p><p>某些系统上某些权限位可能被忽略，而更改某些位可能自动影响其他（例如在无拥有者/群/全体区别的平台上，设置三者任一部分都会写入三者全体的位集）
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;fstream&gt;</span>
<span class="co2">#include &lt;bitset&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;filesystem&gt;</span>
<span class="kw1">namespace</span> fs <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">;</span>
 
<span class="kw4">void</span> demo_perms<span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">perms</span> p<span class="br0">)</span>
<span class="br0">{</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">owner_read</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"r"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">owner_write</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"w"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">owner_exec</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"x"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">group_read</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"r"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">group_write</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"w"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">group_exec</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"x"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">others_read</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"r"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">others_write</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"w"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="br0">(</span>p <span class="sy3">&amp;</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">others_exec</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">none</span> <span class="sy4">?</span> <span class="st0">"x"</span> <span class="sy4">:</span> <span class="st0">"-"</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../io/basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">"test.txt"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 创建文件</span>
 
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Created file with permissions: "</span><span class="sy4">;</span>
    demo_perms<span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">status</span><span class="br0">(</span><span class="st0">"test.txt"</span><span class="br0">)</span>.<span class="me1">permissions</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
    fs<span class="sy4">::</span><span class="me2">permissions</span><span class="br0">(</span><span class="st0">"test.txt"</span>,
                    fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">owner_all</span> <span class="sy3">|</span> fs<span class="sy4">::</span><span class="me2">perms</span><span class="sy4">::</span><span class="me2">group_all</span>,
                    fs<span class="sy4">::</span><span class="me2">perm_options</span><span class="sy4">::</span><span class="me2">add</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"After adding o+rwx and g+rwx:  "</span><span class="sy4">;</span>
    demo_perms<span class="br0">(</span>fs<span class="sy4">::</span><span class="me2">status</span><span class="br0">(</span><span class="st0">"test.txt"</span><span class="br0">)</span>.<span class="me1">permissions</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
    fs<span class="sy4">::</span><span class="me2">remove</span><span class="br0">(</span><span class="st0">"test.txt"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Created file with permissions: rw-r--r--
After adding o+rwx and g+wrx:  rwxrwxr--</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="status.html" title="cpp/filesystem/status"> <span class="t-lines"><span>status</span><span>symlink_status</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  确定文件属性<br>确定文件属性，检查符号链接目标 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="permissions.html" title="cpp/filesystem/permissions"> <span class="t-lines"><span>permissions</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  修改文件访问权限 <br> <span class="t-mark">(函数)</span> </td></tr>
</table>

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NewPP limit report
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Preprocessor generated node count: 9456/1000000
Post‐expand include size: 106438/2097152 bytes
Template argument size: 21336/2097152 bytes
Highest expansion depth: 20/40
Expensive parser function count: 0/100
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